Applied Mechanics and Materials Vols. 541-542

Abstract: Chemical method of extraction was adopted in the study, and aqueous solution of potassium hydroxide and sucrose (KOSH) was used to obtain the clinker rich in silicate phases (alite and belite) in order to get the crystal forms of tricalcium silicates (C₃S) in the belite-barium calcium sulphoaluminate cement clinker. The crystal forms of C₃S were finally determined by XRD (X-ray diffraction) spectrums through its characteristic windows of the diffraction spectrums. Results shows that, C₃S exists in the innovative cement system mainly in the form of M1; C_2.75B_1.25A₃ can completely dissolve in KOSH solution while its dissolution is inhibited in the cement system; after KOSH treatment, diffraction peaks of C₄AF disappear totally and peaks of C₃A has weakened to great extent; for the cement clinker, the clinker ground for 90min has the best extraction rate.

Abstract: In this paper, the selective laser sintering mechanism of sucrose powder materials were studied. This paper uses DSC/TG technology to sucrose by thermo gravimetric analysis. The results show that, the melting point of sucrose at 187 °C, its decomposition temperature at 220°C, 300°C after weight loss in more than 50%, sucrose and reasonable final heating temperature was between 187°C~220°C. The results show that, the melting point of sucrose at 187°C, its decomposition temperature at 220°C, 300°C after weight loss in more than 50%, sucrose and reasonable final heating temperature was between 187°C~220°C.

Abstract: To study the relationship between the hydrolysis degree and calcium-binding capacity of whey protein by enzymatic hydrolysis, the response surface method was firstly used to investigate optimized the hydrolysis conditions of whey protein with protamex and flavorzyme. The optimum process parameters for the whey protein hydrolysis were as follows: Whey protein concentration was 5.0% (w/v), the ratio of protease to whey protein was 4.0% (w/w), the mass ratios of protamex to flavorzyme (w/w) was 2:1, and the reaction temperature was 49 °C. The hydrolysate obtained after the hydrolysis of 7 h, with a hydrolysis degree of 25.92%, possessed the highest Ca-binding capacity of 27.92%. Finally, the relationship between the hydrolysis degree and calcium-binding capacity was established and whey protein hydrolysate with high calcium-binding capacity was prepared, which can provide basic theories for the following optimization of chelation of whey protein hydrolysate with calcium.

Abstract: To explore micro-or nanoscintillator with a controllable architecture, a novel facile hydrothermal method easy for commercial run was used to synthesize pure and Ce doped β-NaLuF₄ microcrystals at 453K. The morphology of uniform hexagonal prism with 3.3μm in diameter and 1.4 μm in thickness, respectively, is presented by the results of scanning electron microscopy (SEM). Powder X-ray diffraction (PXRD) patterns show the products are both pure hexagonal phase. Different from the undoped product without any irradiation, the Ce doped product has given strong broad band emission attributed to 5d4f transition of Ce³⁺, which can be potentially used as scintillator for biomedical imaging and detectors for high energy such as X-ray and γray. This synthetical strategy extends the understanding about nanomaterial chemistry and can be also useful for other systems such as fluorides, oxides and sulfides.

Abstract: This document discusses the physical properties and chemical properties of pectin capsules, which are extracted from waste peel, and make compare between pectin capsules and the gelatin capsules from the current market.

Abstract: Phase change materials are the basis for next generation memory devices, but the fundamental mechanism of the phase transitions has not been elucidated clearly. In this paper, the microstructure treated by isothermal and the laser radiance was compared by Raman spectroscopy. It was found that the peak ~105 cm^-1 originated from GeTe₄ tetrahedral structure and the intensity of this peak became weak with the enhancement of laser pulse energy and extension of annealing time. Moreover, we also ascribed the Raman peaks in specific positions to the GeTe_4-nGe_n (n=0, 1, 2, 3) tetrahedral structures.

Abstract: Strength prediction is discussed using a traction-separation damage model incorporating material softening for bolted joint that fails in bearing mode. The modelling approach in the bolted double-lap joint of current work is a simplistic approach to predict the strength of bearing failures. This is clearly shown in bearing failure which occurred experimentally at higher W/d ratios. A simple method for degrading material properties in the region of bearing failure was investigated and, from a preliminary study, was found to be promising. This approach is easily-implemented, and has been shown to be applicable to woven fabric composite materials in double-lap bolted joint.

Abstract: The grain size of W-Cu nanocomposites would greatly affect the density of W-Cu alloy. In this work, W-Cu oxide nanocomposite powders were prepared by sodium tungstate and copper nitrate via hydrothermal method, and W-Cu nanocomposite powders were obtained by subsequently co-reduction process. The characterization of W-Cu nanocomposite powders were carried out by X-ray diffraction (XRD), scanning electron microscope (SEM), energy spectrum analysis (EDS) and transmission electron microscope (TEM). The results indicated that hydrothermal method was a good method for the preparation of W-Cu oxide nanocomposite powders. W-Cu nanocomposite powders, whose grain size was about 70nm and distributed uniformity, were manufactured by co-reduction process.

Abstract: Plain woven carbon fabric composites using different types of vinyl ester (VE) resin with different toughness have been prepared. The mechanical performances were characterized by different tests, such as tensile, tension-tension fatigue, thermoelastic stress analysis (TSA) and scanning electron microscope (SEM). The results showed that with increasing of fracture toughness of VE as well as adhesive strength between VE and carbon fiber (CF), the tensile strength improved by a range from 23.1 to 33.9%, and fatigue life of CF/VE composites increased by several times to several ten times when low toughness VE was used as control resin. The fatigue damage initiation of CF/VE composites has been investigated by thermoelastic stress analysis. It was found that the initiation and growth of fatigue damage such as matrix cracks was delayed, the linkage of matrix cracks in transverse bundles was inhibited with increasing of fracture toughness and interfacial shear strength (IFSS) of matrix resin.

Abstract: We Study the Stable Configuration of C₅H₈O⁺ by the Method of B3. Using the CIS(Configuration Interaction with Single Substitute) Method, and 6-31+G (d, p) Basis Set, we Calculated the Frequency of Excited State of Cyclopentanone Ion Molecule. Studies on the Possible way of Obtain C₂H₃⁺ Small Fragments by Cyclopentanone Ion.